Ahem, no. Anakin was on his path to the dark side since before he had become a Jedi. He was constantly in fear and hadn't learned to control his emotions earlier in life like most Jedi do. Further, he became a Sith Lord and in an angry rant, killed off almost all of the Jedi. No one is too emotional to be a Jedi if they are brought up correctly and start at the right age. That's why they kept saying "He's too old." To Anakin and Luke.